CVE-2021-42287VulnerabilityPublished 04/11/2022Updated 10/24/2026
CVE-2021-42287: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
Affects Microsoft Active DirectorySource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 04/11/2022
- KEV deadline
- 05/02/2022
- Ransomware
- Used in ransomware campaigns
- EPSS
- 77.2% chance of exploitation in 30 days – higher than 99% of CVEs
What to do
CISA required action
Apply updates per vendor instructions.
Description
CVE-2021-42287 is a high-severity privilege escalation vulnerability in Microsoft Active Directory Domain Services. It allows an attacker to escalate privileges within the Active Directory environment. This vulnerability has been exploited in the wild and is known to have been used in ransomware campaigns. No specific affected versions or patch information is provided in the available data.